George f



(No Model.) 2 Sheets-Sheet 1.

G. F. GALLAGHER & T. B. MOORE. FURNACE.

No. 526,776. Patented 00c 2,1854.

WITNESSES:

ATTORNEY (No Model.) 2 Sheets-Sheet 2.

G. F. GALLAGHER & T. B. MOORE.

' FURNACE.

HHUHUU WITNESSES: w INVENTOR 5,

ATTORNEY Patented 0013. 2, 189.4.

UNITED STATES PATENT OFFICE.

GEORGE F. GALLAGHER AND THOMAS E. MOORE, OF ROCHESTER, NEW YORK,ASSIGNORS OF ONE-THIRD TO HENRY GALLAGHER, OF SAME PLACE.

FURNACE.

SPECIFICATION forming part of Letters Patent No. 526,776, dated October2, 1894.

Application filed April 11, 1891- Serial No. 388,464. (No model.)

To all whom it may concern.-

Be it known that we, GEORGE F. GALLA- GHER and THOMAS E. MOORE, citizensof th e United States, residing at Rochester, in the county of Monroeand State of New York,

have invented certain new and useful Improvements inFurnaces; and we dohereby declare the following to be a full, clear, and exact descriptionof the invention, such as will enable others skilled in the art to whichit appertains to make and use the same, reference being had to theaccompanying drawings, and to figures of reference marked thereon, whichform a part of this specification Our invention relates to improvementsin furnaces, and more particularly to that class of furnaces which havefor their object the entire consumption of all the products ofcombustion and it consists in certain novel features of construction allof which we will now proceed to definitely describe and claim.

In the drawings Figure l is a vertical longitudinal section of a furnaceequipped with our improvement. Fig. 2 is a vertical cross section takenthrough the line m-a: of Fig. 1. Fig. 3 is a plan view taken through theline y-y of Fig. 2.

Long experiment in this line has taught us that it is advisable that theair-inlet passages for supplying superheated air to the fire shall drawtheir air from the rear end of the furnace so as not to interfere withthe draft through the doors below the grate, that such passages shallhave no angles or sharp turns more than are absolutely necessary, thatthey shall not cause the inflowing air to rise and fall (which angles orrise and fall would retard the flow), and that means be provided wherebythe currents supply to the front and rear ends of the fire box can becontrolled independently so that the superheated air can at times beadmitted to the front or rear only, to both, or neither as desired. Inour several patents heretofore granted to one or both of us we havecovered constructions differing considerably from this in principle, butthe chief object of the present invention is to carry out the ideas justset forth.

Referring to the drawings, 1, is the body of the furnace into which theboiler is set.

2, is the bridge-wall; 3, the fire-box, and 4:, the ash-pit.

5, and 6, are super-heating air passages or channels located in the sidewall of the furnace, the passages 5 leading from the back or rear end ofthe furnace to the forward end of the fire-box, and the passages 6,leading from the rear end of the furnace to the'forward end of the firebox returning along the side walls of the fire-box and opening intonarrow passages 14, extending across the bridge-wall 2. These passages14, open into the rear-end of the fire-box through narrow openings 9,and 10, above the grate-bars.

The air passing into the passages 5 through the doors 12 passes alongthe .side walls in the combustion chamber and through the side wall ofthe fire-box thus becoming super heated, and is discharged through theopenings 7, at the forward end of the fire-box. The air passing throughthe doors 11, takes a similar course returning as it reaches the forwardend of the furnace and again passing through the side wall of thefire-box where it passes into the passages 14, (in the bridgewall) andinto the rear-end of the fire-box through the openings 9, and 10.

i The doors 11 and 12, are arranged with dampers for regulating thesupply of air passing through them.

It will be seen that an old furnace of most any construction couldeasily and cheaply be equipped with our improvement.

The passages or channels 5, and 6, shown in Fig. 3 might be arrangedwithin the side walls of the furnace their entire length in place ofpassing through the combustion chamber as shown without departing fromthe spirit of our invention.

We claim-' a A steam boiler furnace having its bridge wall provided inits front side with transverse openings, and its sidewalls provided withhorizontal passages leading from the rear end of the furnace, andindependent from each other throughout their entire lengths the upperpassages leading straight to the front end of the fire box and openingthereinto, and the lower passages leading In testimony-whereof we havesigned our straight from said rear end; then making a names to'thisspecification 1n thepresence of reverse turn, then leading straightrearward, two subscribing witnesses.

and then communicating with the openings GEORGE F. GALLAGHER. 5 in thebridge wall, and dampers at the rear THOMAS E. MOORE.

ends of said passages for controlling them Witnesses:

independently, all as and for the purpose set OTTO HODDICK,

forth. W. T. MILLER.

